Odd that you suggest pairing two different monitors together in the same setup. In my experience, that's a path to eye strain and headaches.

I think it depends on what you're doing on those two screens. I often watch a movie on one while working on the other. For data entry or comparison though, I completely agree with you. That's why my screens at work are the same size.

Odd that you suggest pairing two different monitors together in the same setup. In my experience, that's a path to eye strain and headaches.

I think it depends how different they are. At home I have two 20's paired with a 30. The 20's are portrait mode 1200x1600 screens, the 30 2560x1600, all three are 100DPI; it works great. At work I've got a pair of 22" 1680x1050's and a 19" 1280x1024. They're close enough not to cause any problems.

Working from my kitchen table combining my 14" 1600x900 and one of of my 20" 1600x1200 screens vertically works reasonably well despite one screen being 33% wider than the second. My old laptops 1440x900 and 1440x1050 screens were a lot more awkward in that setup. Some of my coworkers side by side setups with their laptop and either a 22" monitor like mine of a 24" 1920x1200 have always felt disconcerting to me because of the combined height, resolution, and DPI mismatches.

I actually need a monitor arm I can use with a glass-top desk, too. Damn Ikea and their shiny things...

Could you use a wall mounted arm? Or a free standing one with a pedestal that goes down to the floor?

Because of the room setup a wall-mounted arm is probably out. I've never heard of a free-standing one though - all I can picture is something resembling a boom mic with a monitor duck-taped to the end Do they work well?

I actually need a monitor arm I can use with a glass-top desk, too. Damn Ikea and their shiny things...

Could you use a wall mounted arm? Or a free standing one with a pedestal that goes down to the floor?

Because of the room setup a wall-mounted arm is probably out. I've never heard of a free-standing one though - all I can picture is something resembling a boom mic with a monitor duck-taped to the end Do they work well?

A friend of mine's used a DIY version to suspend a 19" monitor over his bed for a decade. I'd assume the commercial variants work as well as their desk mounted siblings.

It'll be expensive though, but we use Chief mounts exclusively and they are among the best if not the best in my opinion. It's a start at least.

Clamp mounts can be used as well, such as this one http://www.chiefmfg.com/Series/KCG , but I do recommend getting a thin sheet of rubber to use as a pad for the clamp and base. Should be available at craft stores or hobby shops I would think.

As long as you don't plan on moving the arm too much it should be fine, however I would not install on any glass tops less than 3/8". Less than that and the glass will have too much flex to handle any kind of stress of that nature and would probably not be strong enough to support the weight anyway.